摘要
通过野外地质调查,在四川拉拉地区天生坝铁矿露天采场发现铜矿化。铜矿化主要表现为黄铜矿-黄铁矿细脉沿围岩裂隙分布和黄铜矿-黄铁矿星点状分布于角砾之间,脉状矿石铜品位0.05%~0.44%,平均0.28%;角砾状矿石铜品位1.54%~1.60%,平均1.57%。黄铜矿交代磁铁矿和黄铁矿,黄铁矿呈交代残余包裹于黄铜矿中。矿石具有较低的初始^(143)Nd/^(144)Nd比值(0.510 626~0.510 811)、负ε_(Nd)(t)值(-2.89^-6.51)和均一的硫同位素(δ^(34)S_(CDT)∶1.4‰~2.0‰)。总之,天生坝铜矿化特征和地球化学特征,均与落凼铜矿特征一致,具有典型的铁氧化铜金矿床特征。天生坝铁矿铜矿化的发现,表明拉拉地区F1断层以南具有较大的找矿潜力,天生坝铁矿深部的河口群变质火山岩值得进一步工作。
The copper mineralization during recent field geology survey was discovered in the Tianshengba iron deposit in the Lala district,Sichuan province. The copper mineralization occurs as chalcopyrite-pyrite veins along fractures in the host-rocks and spots in breccias. The veined ores have copper tenor of 0. 05% ~ 0. 44%（ averaging0. 28%） and the breccia ores have copper tenor of 1. 54% ~ 1. 60%（ averaging 1. 57%）. The chalcopyrite replaces the magnetite and pyrite,and the pyrite present as remnant of replacement in the chalcopyrite. The ores have low initial ^（143）Nd/^（144）Nd value（ 0. 510 626 ~ 0. 510 811）,negative ε_（Nd）（t） value（- 2. 89 ^- 6. 51） and uniform S isotopes（ δ_（34）S_（CDT）∶ 1. 4‰ ~ 2. 0‰）. Overall,the copper mineralization in the Tianshengba iron deposit has the similar characteristics of mineralization and geochemistry to the Loudang copper deposit,and both are IOCG deposits. This discovery indicates that there are prospective exploration potentials to the south of fault F1 and more work should be done in deep volcanic rocks of the Hekou Group in the Tianshengba iron deposit.
出处
《科学技术与工程》
北大核心
2017年第1期137-141,共5页
Science Technology and Engineering
基金
国家自然科学基金(41102044和41102060)
四川省青年科技基金(2012JQ0026)资助
关键词
铜矿化
铁氧化铜金矿床
天生坝铁矿
拉拉地区
iron-oxide-copper-gold deposits
copper mineralization
tianshengba Fe deposit
lala District
